Door cylinder locks and methods of assembly thereof



March 7, 1967 l. v. SINERVO 3,307,334

DOOR CYLINDER LOCKS AND METHODS OF ASSEMBLY THEREOF Filed April 13, 19652 Sheets-Sheet 1 March 1967 v. SINERVO 3,

DOOR CYLINDER LOCKS AND METHODS OF ASSEMBLY THEREOF Filed April 13, 19652 Sheets-$heet 2 FIG. 4'

FIG. 5

United States Patent 3,307,384 DOQR CYLINDER LOCKS AND METHODS OFASSEMBLY THEREOF Into Villian Sinervo, Koskeiantie 29A, Helsinki,Finland Filed Apr. 13, 1965, Ser. No. 447,679 Claims priority,application Finland, Jan. 9, 1963, 36/63 9 Claims. (Cl. 70-370) This isa continuation-in-part of application Serial No. 253,095, filed January22, 1963, and now abandoned.

The invention relates to a cylinder lock for a door and in particular toa safety lock for an outer door and to methods of assembly anddisassembly of such locks to the door. In general, the invention isdirected to the class of locks which comprise a cylinder housing and asurrounding protecting ring or rose. More specifically the invention isdirected to an improved fastening of the protecting ring or rose to thecylinder housing. The rose generally abuts the outside surface of thedoor and engages the cylinder housing so as to prevent the housing frombeing able to be pushed into the aperture in the door in which thecylinder lock is supported. The invention relates particularly to suchan arrangement in which the cylinder is introduced from the inside ofthe door into the aperture. The cylinder housing is provided with earshaving threaded holes for bolts, by which the housing is attached to acoverplate covering the aperture on the inside surface of the door. Thisplate is provided with. a central circular hole for the passage of thelock part transmitting the turning movement of the cylinder to the latchelement of the lock.

In known cylinder locks the outer end of the cylinder housing isprovided with a flange intended to rest against the outside surface ofthe door. The inner end of the cylinder housing is provided withthreaded holes for the mounting screws, which pass through thecoverplate resting against the inside door surface and covering theaperture in the door for accommodating the lock. In these locks thecylinder housing in inserted from the outside of the door into theaperture and the coverplate is held in place against the inside doorsurface. The mounting screws are applied through said coverplate intoscrew holes in the cylinder housing and tightened up, the flange at theouter end of the housing pressing against the outside surface of thedoor. The housing is thus supported between the door surfaces. Theconstruction has, however, the disadvantage that the lock is not asafety lock and burglar-proof in that a pipewrench can be employed toget a good grip on the cylinder housing flange and break the housingloose from the coverplate and remove the lock. To eliminate thisdisadvantage the housing flange in later designs has been reduced to ashoulder of suflicient dimensions to provide engagement with a separaterose or protecting ring surrounding the outer end of the housing andresting against the outside surface of the door. This rose or protectingring can be turned without breaking the mounting screws. In order tomake it more difficult to engage the rose with a pipewrench, the rim ofthe rose has been given a conical shape.

In previous known designs of the last mentioned type the rose had to beslipped over the ears adapted for engaging the mounting screws at theinner end of the cylinder housing. The housing with the rose is theninserted into the aperture in the door from its outside surface. Adisadvantage of this manner of assembling the rose and the cylinderhousing is that the rose and the aperture in the door must becomparatively large. The rose consequently acquires a considerableamount of material.

In other known designs the rose is attached to the cylinder housing bymeans of a split retaining ring accommodated in annular grooves oppositeeach other in the rose and the housing respectively. This arrangementmakes it difficult to separate the rose and the housing in case ofrepair, particularly if the cylinder housing is mounted or has to bedismounted from the inside of the door.

There are also known arrangements, where the rose and cylinder housingare fixedly joined by a wedge shaped ring of a non-metallic material.This ring is driven in between the end of the housing and the rose. Apart of the wedge shaped ring, protrudes above the rose and can beremoved by a pointed tool. A joint of this type is not suitable forsafety locks also for that reason that with a pipewrench one can get agood hold of the housing end and damage it, after the rose has beenremoved.

Still other known earlier arrangements provide for a compressible roseconstruction. The rose is mounted between the outer surface of the doorand an outward protruding flange at the end of the cylinder housing,which is screwed into the latch casing. This type of rose is also notsuitable for safety locks. It is easy to compress the rose and get agood grip with a pipewrench on the outer end of the cylinder housing andscrew it loose from the latch casing.

Still another known arrangement for joining two parts is known, in whicha split retaining ring is seated on a conical surface of one part and isslidable on this surface between two shoulders. This arrangement is notwithout considerable disadvantage applicable to safety locks, because itrequires that the cylinder housing be screwed into the latch housingfrom the outside which leaves the retaining ring partly exposed and thehousing end protruding above the surface of the rose inviting unlawfulremoval of the cylinder housing.

It is anv object of the present invention to eliminate all theaforementioned disadvantages and to create a joint between a cylinderhousing and a rose making the mount ing and dismounting easier, themanufacturing cheaper and reducing the cost of material while yetmaintaining the advantageous features making the lock virtuallytamper-free.

The accompanying drawings show two embodiments showing fastening of therose to the cylinder housing according to the invention.

In the drawing:

FIGURE 1 is a vertical section taken along lines A-A in FIG. 2 showingthe cylinder lock mounted;

FIGURE 2 is a horizontal section through a door with a cylinder lockmounted therein, the cylinder housing being cut away at one of the carsat the inner end, and at a shoulder at the outer end;

FIGURE 3 is a section on enlarged scale of a second embodiment of theinvention at the outer end of the cylinder housing;

FIGURE 4 is a plan view of a split ring with a circular cross-section;and

FIGURE 5 is a plan view of a rose or protecting ring as seen from theoutside of the door.

Reference numeral 1 designates a door, to which the lock is fastened.The cylinder housing 2 is provided with ears 2a with threaded holes foraccommodating mounting screws 2b, which attach the cylinder housing to acoverplate 8 which is applied against the inside surface of the door.This coverplate covers the aperture 12 in the door which accommodatesthe cylinder housing 2, and the coverplate 8 is provided with a hole Sofor the passage of bar 9 having a rectangular cross-section. The bar 9transfers the revolving movement of the cylinder C in the housing to thelatch mechanism (not shown). In FIG. 2, the outer end of the cylinderhousing is provided with a flange or shoulder 4, behind which. a splitretaining ring 5 of spring steel is seated. A rose or protecting ring 6is provided with a central circular opening 3. In the rose 6 is aperipheral radially inward annular protruding flange 7. The innerdiameter of the flange 7 is large enough to permit the flange 4 of thecylinder housing to freely pass through the rose. The retaining ring 5is of such dimensions that it cannot pass over the flange 7 of theprotecting ring 6, when the latter is fitted in position around thecylinder housing 2. The protecting ring 6 is pushed from the outsideover the end of the cylinder housing 2 against the surface of the doorwhen assembling the lock. As soon as the flange 7 of the protecting ringor rose 6 has passed the flange 4 of the cylinder housing 2 theretaining ring 5 is fitted in position whereby said ring prevents theprotecting ring 6 from sliding back over the end of the cylinder housing2.

According to a modified embodiment of the invention a peripheral grooveis formed in the cylinder housing, as shown in FIG. 3, Where the flange4 has been omitted in the outer end of the cylinder housing.

The mounting of a cylinder lock according to the invention is performedin the following way. After the aperture in the door has been made, thecylinder housing 2 is inserted from the inside of the door into theaperture sufliciently far, such that the outer flanged end 4 protrudesbeyond the outside door surface to enable the split retaining ring 5 tobe applied behind the housing flange 4 after the rose 6 has been slippedover the protruding housing end. Thereafter, the cylinder housing 2 ispushed inwards and the coverplate 8 is applied onto the inside surfaceand attached by the mounting screws 2b to the ears 2a of the cylinderhousing 2. When the mounting screws 26 have been tightened, the rose 6and the coverplate 8 are strongly pressed respectively against the outerand inner surfaces of the door, thus clamping the cylinder housing 2 inthe door. The retaining ring 5 .as shown in FIG. 4 is a split ring inorder to allow the ring to be slipped over the shoulder or flange 4 atthe outer end of the cylinder housing 2. The ring 5 is preferably madeof spring steel with a circular cross-section, but it is also possibleto use a ring with a square or rectangular crosssection. If the flange 4is omitted, as shown in FIG. 3 which allows a decrease of the diametraldimensions of the rose, this adds to the saving of material. Thelocation of the groove 10 at the outer end of the cylinder housing 2 isdetermined by the thickness of the inwardly protruding flange 7 of therose.

What is claimed is:

1. A cylinder lock adapted for being mounted in an aperture in a door,said lock comprising a cylinder housing having opposite ends, saidhousing being adapted for I accommodation in said aperture with aportion at one of said ends projecting beyond the door, means to receivea fastener at the other of the ends of the housing for connecting thehousing to the door, a protecting ring encircling the portion of thehousing which projects beyond the door, and retaining ring means betweenthe latter said portion of the housing and the protecting ring to causethe same to be secured in engagement in which relative axial movement inone direction only between the housing and the protecting ring isresisted while relative movement in the opposite direction is permitted.

2. A lock as claimed in claim 1 wherein said protecting ring and saidprojecting portion of the housing have radially projecting shouldersfacing one another between which is interposed said retaining ringmeans.

3. A lock as claimed in claim 2 wherein said ring means is a split ring.

4. A lock as claimed in claim 3 wherein said ring means is constitutedof spring steel.

5. A lock as claimed in claim 1 wherein said housing has a substantiallyuniform diameter and is provided with an annular groove in which theretaining ring means is accommodated, said retaining ring meansprojecting radially outwards of the housing to engage the protectingring.

6. A lock as claimed in claim 3 wherein said retaining ring means has acircular cross-section.

7. A lock as claimed in claim 1 wherein said protecting ring includes aninwardly directed radial flange and the projecting portion includes anoutwardly directed radial flange, said flanges facing one another andengaging the retaining ring means therebetween.

8. A cylinder lock adapted for mounting in the aperture of a door whichhas an inner and an outer surface, said lock comprising a cylinderhousing adapted for extending through said aperture and beyond the outersurface of the door, means to receive a fastener at one end of thehousing for detachably connecting the housing to the inner door surface,a protecting ring encircling the housing and adapted for abuttingagainst the outer door surface, said ring being connected with the outerend of the cylinder housing which extends beyond the outer surface ofthe door, said ring comprising a radially inwardly projecting flangehaving an inside diameter which is sufliciently large to allow the outercylinder housing end to pass therethrough, said outer end of thecylinder housing having a radially outwardly projecting flange, and aretaining ring interposed between the flange of the protecting ring andthe flange of the cylinder housing, said ring being radially resilientand being dimensioned to prevent the protecting ring from passing overthe cylinder housing end to thereby constitute a locking device couplingthe housing and protecting ring together but being removable bydetaching the cylinder housing from the inner door surface and pushingthe cylinder housing in a direction from the inner door surface out ofthe aperture at the outer surface of the door and through the protectingring whereby the retaining ring may be removed.

9. A method of assembling a lock assembly in an aperture in a door, saidmethod comprising inserting a cylinder housing of the lock into theaperture from one side of the door, the housing being inserted to adepth sufficient to allow an end portion of the housing to projectbeyond the other side of the door, axially passing an outer protectingring over the projecting end portion of the housing, and applying aresilient metal ring on the projecting end portion of the housing, theend portion of the housing and the protecting ring being formed so as tosecure the resilient ring in interposed relation therebetween when thehousing is secured to said one side of the door, drawing said endportion of the housing up tightly towards said other side of the doorsuch that the protecting ring is prevented from being withdrawn from theend portion of the housing, the housing being separable from theprotecting ring by being disconnected from said door and then axiallydisplaced away from the other side of the door to expose the resilientring which can be removed from the housing to enable withdrawal of theprotecting ring.

References Cited by the Examiner UNITED STATES PATENTS 1,182,710 5/1916Rowell 285-321 X 1,343,712 6/1920 Eras et al. -416 X 1,741,093 12/1929Briggs 70-367 2,100,233 11/1937 Beaumont. 2,456,355 12/1948 Aber -8.82,847,238 8/1958 Bolling 858.8 X 3,116,362 12/1963 Rankin. 3,199,3238/1965 Niilola 70367 FOREIGN PATENTS 236,833 11/1964 Austria. 292,0356/1928 Great Britain.

EDWARD C. ALLEN, Primary Examiner.

1. A CYLINDER LOCK ADAPTED FOR BEING MOUNTED IN AN APERTURE IN A DOOR,SAID LOCK COMPRISING A CYLINDER HOUSING HAVING OPPOSITE ENDS, SAIDHOUSING BEING ADAPTED FOR ACCOMMODATION IN SAID APERTURE WITH A PORTIONAT ONE OF SAID ENDS PROJECTING BEYOND THE DOOR, MEANS TO RECEIVE AFASTENER AT THE OTHER OF THE ENDS OF THE HOUSING FOR CONNECTING THEHOUSING TO THE DOOR, A PROTECTING RING ENCIRCLING THE PORTION OF THEHOUSING WHICH PROJECTS BEYOND THE DOOR, AND RETAINING RING MEANS BETWEENTHE LATTER SAID PORTION OF THE HOUSING AND THE PROTECTING RING TO CAUSETHE SAME TO BE SECURED IN ENGAGEMENT IN WHICH RELATIVE AXIAL MOVEMENT INONE DIRECTION ONLY BETWEEN THE HOUSING AND THE PROTECTING RING ISRESISTED WHILE RELATIVE MOVEMENT IN THE OPPOSITE DIRECTION IS PERMITTED.